The wavelength-dependent optical properties of weakly absorbing aqueous aerosol particles
The wavelength-dependent optical properties of weakly absorbing aqueous aerosol particles
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DOI：
10.1039/d0cc02737e
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发表时间：
2020-08-14
影响因子：
4.9
通讯作者：
Preston, Thomas C.
中科院分区：
文献类型：
--
作者：
Bain, Alison;Preston, Thomas C.
折射率（RI）是计算气候模式所需的许多气溶胶特性的关键量。为了准确地描述气溶胶的折射率，必须考虑波长和温度的依赖性以及气溶胶含水量的变化。除了水之外，老化的环境气溶胶可以包含无机盐和无数的有机分子。确定每个有机分子的光学性质及其对气溶胶的贡献将是一项非常耗时的任务，在许多情况下，这是一项棘手的任务。使用单气溶胶粒子光谱测量和有效的振荡器模型，我们能够测量参数，可用于准确计算的波长依赖性RI的混合有机-无机含水气溶胶粒子。测量的振荡器参数提出了一些大气相关的无机离子和替代有机物种。最后，研究了温度对振荡器参数的影响。
The refractive index (RI) is a key quantity in calculating many aerosol properties required for climate models. To accurately describe the RI of aerosol, the wavelength and temperature dependence as well as the variation with aerosol water content must be considered. Aside from water, aged ambient aerosol can contain both inorganic salts and a myriad of organic molecules. Determining the optical properties of each organic molecule and their contribution to the aerosol as a whole would be an incredibly time consuming and, in many cases, intractable task. Using single aerosol particle spectroscopy measurements and an effective oscillator model, we are able to measure parameters that can be used to accurately calculate the wavelength-dependent RI of mixed organic-inorganic aqueous aerosol particles. Measured oscillator parameters are presented for a number of atmospherically relevant inorganic ions and surrogate organic species. Finally, the effect of temperature on the oscillator parameters is investigated.